I have a pair of rust free UCA that are of the cutback style, Mid June build Date 68 San Jose car. Both arms have half inch long fatigue cracks as discussed in some older threads at the area cut out near the ball joint. The cracks are on each side of the ball joint towards the closest bolt hole and thru the section of metal. This is consistent with both arms. Both arms had four waffled rivets so I believe them to be original to the car. I found the letter K on one and the number 4 on the other stamped on the top of the ball joint end. Can these cracks be welded/repaired by a qualified welder. The car is being restored as an occasional driver and I am concerned about the integrity of the repaired part. Any input would be greatly appreciated.